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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./OL_SDK/include-openlayers-local.js"></script>
    <script src="./libs/gaode.js"></script>
    <script src="https://lib.baomitu.com/jquery/2.2.4/jquery.js"></script>
</head>

<body>
    <div id="map">
    </div>
    <script>
        var map = new ol.Map({
            target: "map",
            layers: [gaode],
            view: new ol.View({
                projection: 'EPSG:4326',
                center: [114.30, 30.50],
                zoom: 4
            })
        })
        $.ajax({
            url: "/data/index.geojson"
        }).then(data => {
            const geo_format = new ol.format.GeoJSON()
            var features = geo_format.readFeatures(data);
            // console.log(features)//[e,e,e]
            var source = new ol.source.Vector({
                features
            })
            var layer = new ol.layer.Vector({
                source
            })
            map.addLayer(layer)
        })
    </script>
</body>

</html>